Xantrex Technology 3000 - Manual (Page 50)

Battery Types
B–4 975-0128-01-01
Battery Sizing Example
This battery sizing example illustrates a typical calculation, assuming an
opportunity to charge the batteries every three days.
This example illustrates how quickly your battery needs can escalate. To
reduce the required battery size, you can conserve energy by eliminating
or reducing the use of some loads or by re-charging more frequently.
When sizing your battery, resist the temptation to skip the last step of this
calculation (multiplying by 2). More capacity is better since you will have
more reserve capacity, be better able to handle large loads and surge
loads, and your battery won't be discharged as deeply. Battery life is
directly dependent on how deeply the battery is discharged. The deeper
the discharge, the shorter the battery life.
Appliance
(A) Power
Consumption (Watts) (B) Operating Time
per Day (Hours)
Daily watt-hours needed
for this appliance
(= A x B)
TV & VCR 200 W 2 hours 400 Wh
Microwave oven 1400 W 15 min = 1/4 hour 350 Wh
3 lamps, 60 W
each 180 W 4 hours 720 Wh
Coffee maker 600 W 15 min = 1/4 hour 150 Wh
Steam iron 700 W 6 min = 1/10 hour 70 Wh
Total daily watt-hours of AC load 1690 Wh
x Number of days between charges 3
= Total watt-hours of AC load between charges 5070 Wh
Battery Ah used between charges (divide by 10) 507 Ah
Recommended Battery Bank Size in Ah (multiply by 2) 1014 Ah
XPower3000.book Page 4 Wednesday, December 10, 2003 6:52 AM